08-23-2010
The stack is the program's "blackboard". It's the place local variables and function call stack frames get stored, so anything that does anything in your program is going to leave junk scribbled all over it. Make a few function calls and printf's output may change... Calling printf without giving it any arguments to print just causes it to read the "top" of it no matter what's on it. Which bits? That's undefined -- but can include local variables and function call frames. Really, your output is not so amazing.
Last edited by Corona688; 08-23-2010 at 12:52 PM..
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LEARN ABOUT MOJAVE
backtrace_symbols
backtrace(3) BSD Library Functions Manual backtrace(3)
NAME
backtrace, backtrace_symbols, backtrace_symbols_fd -- call stack backtrace and display functions
SYNOPSIS
#include <execinfo.h>
int
backtrace(void** array, int size);
char**
backtrace_symbols(void* const* array, int size);
void
backtrace_symbols_fd(void* const* array, int size, int fd);
DESCRIPTION
These routines provide a mechanism to examine the current thread's call stack.
backtrace() writes the function return addresses of the current call stack to the array of pointers referenced by array. At most, size
pointers are written. The number of pointers actually written to array is returned.
backtrace_symbols() attempts to transform a call stack obtained by backtrace() into an array of human-readable strings using dladdr(). The
array of strings returned has size elements. It is allocated using malloc() and should be released using free(). There is no need to free
the individual strings in the array.
backtrace_symbols_fd() performs the same operation as backtrace_symbols(), but the resulting strings are immediately written to the file
descriptor fd, and are not returned.
EXAMPLE
#include <execinfo.h>
#include <stdio.h>
...
void* callstack[128];
int i, frames = backtrace(callstack, 128);
char** strs = backtrace_symbols(callstack, frames);
for (i = 0; i < frames; ++i) {
printf("%s
", strs[i]);
}
free(strs);
...
HISTORY
These functions first appeared in Mac OS X 10.5.
SEE ALSO
dladdr(3), malloc(3)
Mac OS X February 15, 2007 Mac OS X